Have students make separate cards for the endings/suffixes in the box and these vowel + |r| sounds words: court, rehearse, hard, flirt, distort, form, arm, affirm.
Ask students to combine the word cards with the ending/suffix cards to see what word families they can build.
(There may be some spelling changes, and a word may use more than one ending; students can consult a class dictionary for help.)
They can then make word webs for each word family with three or more branches.